CN113915162B - Back centrifugal fan efficiency improving wheel disc and back centrifugal fan - Google Patents
Back centrifugal fan efficiency improving wheel disc and back centrifugal fan Download PDFInfo
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- CN113915162B CN113915162B CN202111306739.1A CN202111306739A CN113915162B CN 113915162 B CN113915162 B CN 113915162B CN 202111306739 A CN202111306739 A CN 202111306739A CN 113915162 B CN113915162 B CN 113915162B
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- 108700041286 delta Proteins 0.000 claims description 6
- 230000001737 promoting effect Effects 0.000 claims 1
- 230000003068 static effect Effects 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 238000005452 bending Methods 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000007921 spray Substances 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses an efficiency improving wheel disc of a backward centrifugal fan and the backward centrifugal fan, wherein the wheel disc comprises a plurality of meridian surfaces, each meridian surface corresponds to one noon runner, each meridian surface comprises a first radial molded line, a second radial molded line and a plurality of circumferential molded lines, the first radial molded line and the second radial molded line are extension lines of intersecting lines of two adjacent blades in any meridian runner and the wheel disc mounting position, the circumferential molded lines are arranged between the first radial molded lines and the second radial molded lines, and each circumferential molded line comprises at least one concave circumferential molded line which is concavely distributed along the direction from the first radial molded line to the second radial molded line and at least one upward convex circumferential molded line which is convexly distributed along the direction from the first radial molded line to the second radial molded line. According to the invention, the wheel disc is in a petal-shaped structure by matching the concave circumferential molded line and the convex circumferential molded line on the meridian plane, so that the functional force of the invention is stronger than that of the conventional wheel disc, and when the rotating speed is fixed, the blades required for reaching a certain pressure head are smaller.
Description
Technical Field
The invention belongs to the technical field of fans, and particularly relates to a backward centrifugal fan efficiency improving wheel disc and a backward centrifugal fan.
Background
In the fan industry, the common radial channel wheel disc molded lines of the backward centrifugal fan are in relatively simple shapes such as straight lines, single arcs and spline curves, so that the static pressure efficiency of the backward centrifugal fan is influenced, and the static pressure efficiency is required to be improved for certain application scenes with higher static pressure efficiency requirements.
The patent with publication number CN204663976U relates to a centrifugal fan impeller, which comprises a rear disc, a front disc, a steel tube, blades and a shaft disc; the shaft disc is arranged at the center of the rear disc; the blades are arranged among the front disc, the rear disc and the guide disc; the guide disc is arranged outside the shaft disc, is inserted into the blades, and is welded with the rear disc and the blades in a staggered manner; the steel pipe is arranged at the outer side of the shaft disc, and more than 3 reinforcing plates are arranged at the outer side of the steel pipe; one end of the steel pipe is connected with the rear disc, and the other end of the steel pipe is connected with the guide disc; one end of the shaft disc is connected with the rear disc, and the other end of the shaft disc is connected with the steel tube and the guide disc. The wind wheel rear disc in the patent is in a conventional single circular arc shape.
The patent application with the publication number of CN109441859A relates to a centrifugal fan for cooling an inter-city motor train unit auxiliary power supply cabinet, which comprises a motor mounting plate, a top plate, an air inlet duct, a supporting rod, an impeller and a motor; the air inlet channel is fixedly connected with the top plate; the impeller is connected with the motor; the motor mounting plate and the top plate are connected into a whole through the support rod; the impeller is of a volute-free single-impeller structure, and the impeller body part comprises a front wheel disc, a rear wheel disc, a wheel core and blades; the blades are welded between the front wheel disc and the rear wheel disc, and the wheel core is arranged at the center of the impeller wheel body; the rear wheel disc is cone-shaped. The rear wheel disc of the wind wheel is in a cone cylindrical shape, the meridian passage wheel disc molded line of the rear wheel disc is a spline curve, and the rear wheel disc cannot meet certain application scenes with higher static pressure efficiency requirements.
Disclosure of Invention
The invention aims to provide a backward centrifugal fan efficiency improving wheel disc which is used for solving the prior technical problems, and the wheel disc is in a petal-shaped structure by matching a concave circumferential molded line and an upward convex circumferential molded line on a surface, so that the functional force of the invention is stronger than that of a conventional wheel disc form, and when the rotating speed is fixed, blades required for reaching a certain pressure head are smaller.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the utility model provides a centrifugal fan of backward is put forward rim plate, the rim plate is used for providing mounted position for centrifugal fan's blade, form the runner between every two adjacent blades and the surface of rim plate and wheel cap, the rim plate includes a plurality of face, every the face is faced a runner, i.e. a plurality of runner will the rim plate is cut apart into a plurality of faces, the face includes first radial molded line, second radial molded line and a plurality of circumference molded line, first radial molded line and second radial molded line are the intersection extension line of two adjacent blades in any runner and rim plate mounted position department, first radial molded line with second radial molded line is by the one end that the intersection is close to the rim plate center extends to the outside edge position of rim plate, circumference molded line sets up between first radial molded line and the second radial molded line, circumference molded line includes at least one along first radial molded line to second radial molded line orientation and is concave circumference molded line and at least one along first radial to the protruding circumference molded line that goes up of second radial direction and is protruding upward and distributes. The first radial profile and the second radial profile in each of the faces are edge radial profiles of the face.
More preferably, the circumferential profile is a ternary curve extending in the circumferential direction.
Preferably, the radial profile between the first radial profile and the second radial profile of each of the faces is a multi-segment curved line of concave, convex and concave shape from the center to the edge of the wheel disc.
Preferably, a radial profile between the first radial profile and the second radial profile of each of the faces is at a concave point at the concave circumferential profile position, and a radial profile between the first radial profile and the second radial profile of each of the faces is at a convex point at the convex circumferential profile position.
Preferably, in the radial direction, the circumferential molded lines include at least two concave circumferential molded lines and an upward convex circumferential molded line, the circumferential edge molded line of the wheel disc is one of the concave circumferential molded lines, the upward convex circumferential molded line is disposed next to the circumferential edge molded line, and both sides of the upward convex circumferential molded line along the radial direction are distributed with the concave circumferential molded lines.
Preferably, in the radial direction of the surface, the starting points of the first radial molded line and the second radial molded line are close to the center of the wheel disc, the ending points of the first radial molded line and the second radial molded line are located at the edge of the wheel disc, the ratio gamma of the distance from the first end point of the connection between the upward circumferential molded line and the first radial molded line to the starting point of the first radial molded line to the length M of the first radial molded line ranges from 75% to 95%, the ratio gamma of the distance from the second end point of the connection between the upward circumferential molded line and the second radial molded line to the starting point of the second radial molded line to the length N of the second radial molded line ranges from 75% to 95%, and the ratio gamma of the distance from any end point between the first end point of the upward circumferential molded line and the second end point to the starting point of the radial molded line is from 75% to 95%.
Preferably, the distance between the connecting line between the first end point and the second end point of the upward convex circumferential molded line and the first radial molded line and the second radial molded line, respectively, and the salient point of the upward convex circumferential molded line is the upward convex maximum height H, the ratio of the upward convex maximum height H to the diameter R of the wheel disc is zeta, and the value range of zeta is 0.008-0.025.
Preferably, along the radial direction of the face, the circumferential profile includes a first concave circumferential profile, a second concave circumferential profile, a third concave circumferential profile, and an upward convex circumferential profile, the upward convex circumferential profile is disposed between the second concave circumferential profile and the third concave circumferential profile, and the third concave circumferential profile is located at the circumferential edge of the wheel disc.
Preferably, in the radial direction of the surface, the value range of the ratio λ of the distance from the first end point of the first concave circumferential molded line connected with the first radial molded line to the starting point of the first radial molded line to the length M of the first radial molded line is 5% -30%, the value range of the ratio λ of the distance from the second end point of the first concave circumferential molded line connected with the second radial molded line to the starting point of the second radial molded line to the length N of the second radial molded line is 5% -30%, and the value range of the ratio of the distance from any end point between the first end point and the second end point of the first concave circumferential molded line to the starting point of the radial molded line to the length of the radial molded line is 5% -30%;
along the radial direction of the surface, the value range of the ratio beta of the distance from the first end point of the second concave circumferential molded line connected with the first radial molded line to the starting point of the first radial molded line to the length M of the first radial molded line is 40% -70%, the value range of the ratio beta of the distance from the second end point of the second concave circumferential molded line connected with the second radial molded line to the starting point of the second radial molded line to the length N of the second radial molded line is 40% -70%, and the ratio range of the distance from any end point between the first end point and the second end point of the second concave circumferential molded line to the starting point of the radial molded line to the length of the radial molded line is 40% -70%.
Preferably, the distances between the connecting lines between the two endpoints of the first concave circumferential molded line, the second concave circumferential molded line and the third concave circumferential molded line, which are connected with the first radial molded line and the second radial molded line, and the concave points of the first concave circumferential molded line, the second concave circumferential molded line and the third concave circumferential molded line are respectively the concave maximum heights L1, L2 and L3, the ratio of the maximum concave heights L1, L2 and L3 to the diameter R of the wheel disc is respectively equal to the maximum concave relative heights delta 1, delta 2 and delta 3 of the first concave circumferential molded line, the second concave circumferential molded line and the third concave circumferential molded line, the value range of delta 1 is 0.01-0.02, the value range of delta 2 is 0.025-0.045, and the value range of delta 3 is 0.02-0.04.
The second object of the invention is to provide a backward centrifugal fan, comprising a wheel cover, a wheel disc and a plurality of blades arranged between the wheel cover and the wheel disc, wherein the wheel disc is any one of the wheel discs.
The beneficial effects are that:
the surface of the efficiency improving wheel disc of the backward centrifugal fan comprises radial molded lines and circumferential molded lines, and the circumferential molded lines and the radial molded lines of the wheel disc are designed with space curves, so that the sectional molded lines of the wheel disc are not single molded lines, the wheel disc is in a petal-shaped structure through the matching of the concave circumferential molded lines and the convex circumferential molded lines on the surface, so that any flow channel of the centrifugal fan provided with the wheel disc of the invention forms a flow channel form similar to a spray pipe along the flow field direction, the position of the convex circumferential molded lines on the surface is equivalent to the throat position of the flow channel, fluid is compressed first and then is diffused, the functional force of the invention is further strong compared with that of the conventional wheel disc form, the blade required for reaching a certain pressure head is smaller when the rotating speed is fixed, and the pressure head is energy of the fluid per unit weight. When the wheel cover and the blades of the backward centrifugal fan are fixed, the higher the rotating speed is, the lower the power consumption of a certain pressure head is achieved by adopting the petal-type wheel disc compared with a conventional wheel disc, and the higher the static pressure efficiency is.
Drawings
FIG. 1 is a diagram showing a structure of a backward centrifugal fan according to embodiment 5 of the present invention;
FIG. 2 is a cross-sectional view taken at A-A of FIG. 1;
FIG. 3 is a diagram showing a structure of a rear centrifugal fan efficiency improving wheel disc according to embodiment 1 of the present invention;
FIG. 4 is a top view of a rear centrifugal fan efficiency wheel according to embodiment 1 of the present invention;
FIG. 5 is a cross-sectional view at B-B in FIG. 4;
FIG. 6 is a schematic length diagram of a first radial profile and a second radial profile of a wheel disc surface according to embodiment 1 of the present invention;
FIG. 7 is a schematic view showing the height H of the upward projection of the circumferential line of the wheel disc surface in embodiment 1 of the present invention;
FIG. 8 is a schematic view showing a concave height L2 of a second concave circumferential line of a wheel disc surface in embodiment 1 of the present invention;
the technical features indicated by the reference numerals in the drawings are as follows:
1. a wheel disc; 11. a first radial profile; 12. a second radial profile; 131. a first concave curve; 132. an upward convex curve; 133. a second concave curve; 14. a first concave circumferential profile; 15. a second concave circumferential profile; 16. an upward convex circumferential molded line; 17. a third concave circumferential profile; 2. wheel cover; 3. a blade; 4. a flow passage; 41. and (5) a surface.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description will explain the specific embodiments of the present invention with reference to the accompanying drawings. It is evident that the drawings in the following description are only examples of the invention, from which other drawings and other embodiments can be obtained by a person skilled in the art without inventive effort.
The technical scheme of the invention is described in detail in the following by specific embodiments.
Example 1
As shown in fig. 1, a rear centrifugal fan efficiency improving wheel disc 1 is used for providing a mounting position for blades 3 of a centrifugal fan, a flow channel 4 is formed between each two adjacent blades 3 and surfaces of the wheel disc 1 and a wheel cover 2, the wheel disc 1 comprises a plurality of surfaces 41, each surface 41 corresponds to one flow channel 4, namely, the wheel disc 1 is divided into a plurality of surfaces 41 by a plurality of flow channels 4, as shown in fig. 3, the surfaces 41 comprise a first radial molded line 11, a second radial molded line 12 and a plurality of circumferential molded lines, the first radial molded line 11 and the second radial molded line 12 are extension lines of intersection lines of two adjacent blades 3 in any flow channel 4 and the mounting position of the wheel disc 1, the first radial molded line 11 and the second radial molded line 12 extend from one end of the intersection line close to the center of the wheel disc 1 to the outer edge position of the wheel disc 1, the circumferential molded line is arranged between the first radial molded line 11 and the second radial molded line 12, and the circumferential molded line comprises at least one first radial molded line 11 and at least one second radial molded line 12 which are concave in a first radial molded line and a second radial molded line 16 which are concave in a radial molded line in a concave radial direction. The first radial profile 11 and the second radial profile 12 in each of the faces 41 are edge radial profiles of that face 41.
The circumferential molded lines can also be space curves extending along the circumferential direction, and the sectional views of the wheel disc 1 at different radial positions are inconsistent due to the fact that the section molded lines of the wheel disc 1 are drawn by the space curves.
As shown in fig. 4 and 5, the radial profile between the first radial profile 11 and the second radial profile 12 of each of the faces 41 has a plurality of curved curves of concave, convex and concave again from the center to the edge of the wheel disc 1, that is, the radial profile has at least a first concave curve 131, a convex curve 132 and a second concave curve 133. The concave depth and the convex height determine the acting size and the static pressure efficiency of the impeller, and the curve design of the radial molded line and the circumferential molded line can enable the section molded line of the wheel disc 1 to be not a single molded line.
The radial profile between the first radial profile 11 and the second radial profile 12 of each of the faces 41 is in a concave point at the concave circumferential profile location and the radial profile between the first radial profile 11 and the second radial profile 12 of each of the faces 41 is in a convex point at the convex circumferential profile 16 location. Namely, at the position of the concave circumferential molded line, the radial molded line is just at the concave point position of the concave section, and at the position of the convex circumferential molded line 16, the radial molded line is just at the convex point position of the convex section, so that the wheel disc 1 in the embodiment has both circumferential bending and radial bending at the position of the circumferential molded line, and the wheel disc 1 has two-direction bending, so that the section molded line of the surface 41 is not a single molded line.
In this embodiment, along the radial direction, the circumferential molded lines include at least two concave circumferential molded lines and an upward convex circumferential molded line 16, the circumferential edge molded line of the wheel disc 1 is one of the concave circumferential molded lines, the upward convex circumferential molded line 16 is disposed adjacent to the circumferential edge molded line, and the concave circumferential molded lines are distributed on two sides of the upward convex circumferential molded line 16 along the radial direction.
As shown in fig. 3, in the radial direction of the face 41, the circumferential molded lines preferably include a first concave circumferential molded line 14, a second concave circumferential molded line 15, a third concave circumferential molded line 17, and an upward convex circumferential molded line 16, where the upward convex circumferential molded line 16 is disposed between the second concave circumferential molded line 15 and the third concave circumferential molded line 17, and the third concave circumferential molded line 17 is located at the circumferential edge of the wheel disc 1. The wheel disc 1 is in a petal-shaped structure in the arrangement mode, so that after the wheel disc 1 is assembled on a centrifugal fan, any flow channel 4 forms a flow channel form similar to a spray pipe along the flow field direction, the upward convex circumferential molded line 16 on the surface 41 is equivalent to the position of the throat part of the flow channel 4, fluid is compressed first and then is diffused, the functional force of the invention is higher than that of the conventional wheel disc 1, when the rotating speed is fixed, the blade 3 required for reaching a certain pressure head is smaller, and the pressure head is the energy of fluid per unit weight. When the rotation speed is higher when the backward centrifugal fan wheel cover 2 and the blades 3 are fixed, the petal type wheel disc 1 provided by the invention has lower power consumption of a certain pressure head and higher static pressure efficiency compared with the conventional wheel disc 1.
As shown in fig. 6 and 7, in the radial direction of the face 41, the starting point of the first radial molded line 11 and the second radial molded line 12 is close to the center of the wheel disc 1, the ending point of the first radial molded line 11 and the second radial molded line 12 is located at the edge of the wheel disc 1, the ratio γ of the distance from the first end point of the raised circumferential molded line 16 connected with the first radial molded line 11 to the length M of the first radial molded line 11 ranges from 75% to 95%, the ratio γ of the distance from the second end point of the raised circumferential molded line 16 connected with the second radial molded line 12 to the starting point of the second radial molded line 12 ranges from 75% to 95%, and the ratio γ of the distance from any end point between the first end point and the second end point of the raised circumferential molded line 16 to the starting point of the radial molded line is from 75% to 95%. The distance between the connecting line between the first end point and the second end point of the upward convex circumferential molded line 16, which are respectively connected with the first radial molded line 11 and the second radial molded line 12, and the salient point of the upward convex circumferential molded line 16 along the circumferential direction is the upward convex maximum height H, the ratio of the upward convex maximum height H to the diameter R of the wheel disc 1 is zeta, and the value range of zeta is 0.008-0.025. The arrangement is such that the raised circumferential profile 16 is closer to the edge of the disc 1 and the outlet side of the air flow is such that when the air flow passes over the raised circumferential profile 16, the radial profile of the face 41 passing over any point at the raised circumferential profile 16 is different, such that the cross-sectional profile is not a single profile, thus forming a complex petal-shaped disc 1 structure, since the raised circumferential profile 16 is both circumferentially and radially convex and both circumferentially and radially curved in a distribution of the raised trend. Therefore, the air flow at the position is compressed and then diffused, so that the acting capacity of the air flow is stronger than that of the wheel disc 1 with the linear line, the single circular arc and the spline curve. The first concave circumferential profile 14 and the second concave circumferential profile 15 are similar in structure to the wheel disc 1 at the first convex circumferential profile 16, except that the bending direction is reversed.
As shown in fig. 6 and 8, along the radial direction of the surface 41, the value range of the ratio λ of the distance from the first end point of the first concave circumferential profile 14 connected to the first radial profile 11 to the starting point of the first radial profile 11 to the length M of the first radial profile 11 is 5% to 30%, the value range of the ratio λ of the distance from the second end point of the first concave circumferential profile 14 connected to the second radial profile 12 to the starting point of the second radial profile 12 to the length N of the second radial profile 12 is 5% to 30%, and the value range of the ratio of the distance from any end point between the first end point and the second end point of the first concave circumferential profile 14 to the starting point of the radial profile at that point to the length of the radial profile at that point is 5% to 30%;
along the radial direction of the surface 41, the value range of the ratio β of the distance from the first end point of the second concave circumferential molded line 15 connected with the first radial molded line 11 to the starting point of the first radial molded line 11 to the length M of the first radial molded line 11 is 40% -70%, the value range of the ratio β of the distance from the second end point of the second concave circumferential molded line 15 connected with the second radial molded line 12 to the starting point of the second radial molded line 12 to the length N of the second radial molded line 12 is 40% -70%, and the ratio of the distance from any end point between the first end point and the second end point of the second concave circumferential molded line 15 to the starting point of the radial molded line at that point to the length of the radial molded line at that point is 40% -70%.
The distance between the connecting line between the two end points of the first concave circumferential molded line 14 and the connection between the two end points of the first radial molded line 11 and the second radial molded line 12 and the concave point of the first concave circumferential molded line 14 are concave maximum height L1, the ratio of the concave maximum height L1 to the diameter R of the wheel disc 1 is the concave maximum relative height delta 1 of the first concave circumferential molded line 14, and the value range of delta 1 is 0.01-0.02.
The distance between the connecting line between the two end points of the second concave circumferential molded line 15 and the first radial molded line 11 and the second radial molded line 12 and the concave point of the second concave circumferential molded line 15 is the concave maximum height L2, the ratio of the concave maximum height L2 to the diameter R of the wheel disc 1 is the concave maximum relative height δ2 of the second concave circumferential molded line 15, and the δ2 takes a value ranging from 0.025 to 0.045.
The distance between the connecting line between the two end points of the third concave circumferential molded line 17 and the first radial molded line 11 and the second radial molded line 12 and the concave point of the third concave circumferential molded line 17 is the concave maximum height L3, the ratio of the concave maximum height L3 to the diameter R of the wheel disc 1 is the concave maximum relative height delta 3 of the third concave circumferential molded line 17, and the delta 3 takes a value in the range of 0.02-0.04.
The relationship between δ1, δ2, δ3 is: δ1 < δ3, δ1 < δ2.
Example 2
The present embodiment only describes differences from the above embodiment, in this embodiment, in the radial direction, the circumferential molded lines include four concave circumferential molded lines and one convex circumferential molded line 16, and in the direction of the starting point and the ending point of the first radial molded line 11, the circumferential molded lines include a first concave circumferential molded line 14, a second concave circumferential molded line 15, a convex circumferential molded line 16, a third concave circumferential molded line 17, and a fourth concave circumferential molded line in sequence, the convex circumferential molded line 16 is disposed between the second concave circumferential molded line 15 and the third concave circumferential molded line 17, and the fourth concave circumferential molded line is located at the circumferential edge of the wheel disc 1.
Example 3
The present embodiment only describes differences from the above-described embodiment, in this embodiment, in the radial direction, the circumferential molded lines include four concave circumferential molded lines and two convex circumferential molded lines 16, and in the direction of the starting point and ending point of the first radial molded line 11, the circumferential molded lines include a first concave circumferential molded line 14, a second concave circumferential molded line 15, a first convex circumferential molded line 16, a third concave circumferential molded line 17, a second convex circumferential molded line 16, and a fourth concave circumferential molded line in this order, and the fourth concave circumferential molded line is located at the circumferential edge of the wheel disc 1.
Example 4
As shown in fig. 1 and 2, a backward centrifugal fan comprises a shroud 2, a wheel disc 1 and a plurality of blades 3 arranged between the shroud 2 and the wheel disc 1, wherein the wheel disc 1 is the wheel disc 1 in any embodiment.
The embodiment of the invention provides a backward centrifugal fan efficiency improving wheel disc. The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the core concepts of the invention. It should be noted that it will be apparent to those skilled in the art that the present invention may be modified and adapted without departing from the principles of the present invention, and that such modifications and adaptations are intended to be within the scope of the appended claims.
Claims (4)
1. A rear centrifugal fan efficiency improving wheel disc, wherein the wheel disc (1) is used for providing mounting positions for blades (3) of the centrifugal fan, a flow channel (4) is formed between each two adjacent blades (3) and the surfaces of the wheel disc (1) and a wheel cover (2), and the rear centrifugal fan efficiency improving wheel disc is characterized in that the wheel disc (1) comprises a plurality of surfaces (41), each surface (41) corresponds to one flow channel (4), the surfaces (41) comprise a first radial molded line (11), a second radial molded line (12) and a plurality of circumferential molded lines, the first radial molded line (11) and the second radial molded line (12) are intersecting lines between two adjacent blades (3) in any flow channel (4) and the wheel disc (1), and the circumferential molded lines are arranged between the first radial molded line (11) and the second radial molded line (12), and comprise concave circumferential molded lines which are distributed in a concave manner in the direction from the first radial molded line (11) to the second radial molded line (12) and convex molded lines which are distributed in the radial direction (16) from the first radial molded line (11) to the second radial molded line (12);
along the radial direction of the surface (41), the starting point of the first radial molded line (11) and the second radial molded line (12) is close to the center of the wheel disc (1), the ending point of the first radial molded line (11) and the second radial molded line (12) is positioned at the edge of the wheel disc (1), the value range of the ratio gamma of the distance from the first end point of the upward convex circumferential molded line (16) connected with the first radial molded line (11) to the starting point of the first radial molded line (11) to the length M of the first radial molded line (11) is 75% -95%, the value range of the ratio gamma of the distance from the second end point of the upward convex circumferential molded line (16) connected with the second radial molded line (12) to the length N of the second radial molded line (12) is 75% -95%, and the value range of the ratio gamma of the distance from any end point between the first end point of the upward convex circumferential molded line (16) and the second end point to the starting point of the upward convex circumferential molded line (16) to the radial molded line at the position is 75% -95%;
the distance between the connecting line between the first end point and the second end point, which are respectively connected with the first radial molded line (11) and the second radial molded line (12), of the upward convex circumferential molded line (16) and the salient point of the upward convex circumferential molded line (16) is the upward convex maximum height H, the ratio of the upward convex maximum height H to the diameter d of the wheel disc (1) is zeta, and the value range of zeta is 0.008-0.025;
along the radial direction of the surface (41), the circumferential molded lines comprise a first concave circumferential molded line (14), a second concave circumferential molded line (15), a third concave circumferential molded line (17) and an upward convex circumferential molded line (16), the upward convex circumferential molded line (16) is arranged between the second concave circumferential molded line (15) and the third concave circumferential molded line (17), and the third concave circumferential molded line (17) is positioned at the circumferential edge of the wheel disc (1);
along the radial direction of the surface (41), the value range of the ratio lambda of the distance from the first end point of the first concave circumferential molded line (14) connected with the first radial molded line (11) to the starting point of the first radial molded line (11) to the length M of the first radial molded line (11) is 5-30%, the value range of the ratio lambda of the distance from the second end point of the first concave circumferential molded line (14) connected with the second radial molded line (12) to the starting point of the second radial molded line (12) to the length N of the second radial molded line (12) is 5-30%, and the value range of the ratio lambda of the distance from any end point between the first end point and the second end point of the first concave circumferential molded line (14) to the starting point of the radial molded line at the position to the length of the radial molded line at the position is 5-30%;
along the radial direction of the surface (41), the value range of the ratio beta of the distance from a first end point of the second concave circumferential molded line (15) connected with the first radial molded line (11) to the starting point of the first radial molded line (11) to the length M of the first radial molded line (11) is 40-70%, the value range of the ratio beta of the distance from a second end point of the second concave circumferential molded line (15) connected with the second radial molded line (12) to the starting point of the second radial molded line (12) to the length N of the second radial molded line (12) is 40-70%, and the value range of the ratio beta of the distance from any end point between the first end point and the second end point of the second concave circumferential molded line (15) to the starting point of the radial molded line is 40-70%;
the distance between the concave points of the first concave circumferential molded line (14), the second concave circumferential molded line (15) and the third concave circumferential molded line (17) and the two endpoints connected with the first radial molded line (11) and the second radial molded line (12) is equal to the concave maximum heights L1, L2 and L3, the ratio of the concave maximum heights L1, L2 and L3 to the diameter R of the wheel disc (1) is equal to the concave maximum relative heights delta 1, delta 2 and delta 3 of the first concave circumferential molded line (14), the second concave circumferential molded line (15) and the third concave circumferential molded line (17), the delta 1 is in the range of 0.01-0.02, the delta 2 is in the range of 0.025-0.045, and the delta 3 is in the range of 0.02-0.04.
2. A backward centrifugal fan efficiency rim according to claim 1, wherein the radial profile between the first radial profile (11) and the second radial profile (12) of each of said faces (41) is a multi-segment curved profile concave, convex, concave again from the centre to the edge of the rim (1).
3. A backward centrifugal fan efficiency promoting wheel disc according to claim 1, wherein the radial profile between the first radial profile (11) and the second radial profile (12) of each said face (41) is in a concave point at said concave circumferential profile position, and the radial profile between the first radial profile (11) and the second radial profile (12) of each said face (41) is in a convex point at said convex circumferential profile (16) position.
4. A backward centrifugal fan comprising a shroud (2), a wheel disc (1) and a number of blades (3) arranged between the shroud (2) and the wheel disc (1), characterized in that the wheel disc (1) is a wheel disc (1) according to any one of claims 1-3.
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| CN202111306739.1A CN113915162B (en) | 2021-11-05 | 2021-11-05 | Back centrifugal fan efficiency improving wheel disc and back centrifugal fan |
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| CN202111306739.1A CN113915162B (en) | 2021-11-05 | 2021-11-05 | Back centrifugal fan efficiency improving wheel disc and back centrifugal fan |
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| CN113915162B true CN113915162B (en) | 2024-04-09 |
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Citations (5)
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|---|---|---|---|---|
| US6247897B1 (en) * | 1998-06-15 | 2001-06-19 | Dinesh Patel | Vane system |
| JP2001263294A (en) * | 2000-03-23 | 2001-09-26 | Daikin Ind Ltd | Impeller for centrifugal turbo air machine, centrifugal turbo air machine, and air conditioner |
| CN101253333A (en) * | 2005-09-30 | 2008-08-27 | 大金工业株式会社 | Centrifugal fan and air conditioner using the same |
| DE202009018770U1 (en) * | 2009-02-12 | 2013-03-07 | Ebm-Papst Mulfingen Gmbh & Co. Kg | Radial or diagonal fan wheel |
| CN105422506A (en) * | 2015-12-22 | 2016-03-23 | 浙江亿利达风机股份有限公司 | Backward centrifugal wind wheel |
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2021
- 2021-11-05 CN CN202111306739.1A patent/CN113915162B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6247897B1 (en) * | 1998-06-15 | 2001-06-19 | Dinesh Patel | Vane system |
| JP2001263294A (en) * | 2000-03-23 | 2001-09-26 | Daikin Ind Ltd | Impeller for centrifugal turbo air machine, centrifugal turbo air machine, and air conditioner |
| CN101253333A (en) * | 2005-09-30 | 2008-08-27 | 大金工业株式会社 | Centrifugal fan and air conditioner using the same |
| DE202009018770U1 (en) * | 2009-02-12 | 2013-03-07 | Ebm-Papst Mulfingen Gmbh & Co. Kg | Radial or diagonal fan wheel |
| CN105422506A (en) * | 2015-12-22 | 2016-03-23 | 浙江亿利达风机股份有限公司 | Backward centrifugal wind wheel |
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| CN113915162A (en) | 2022-01-11 |
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